Improvement in machinery for shaving the heads of screw-blanks



C. WHIPPLE. I

Making Screws.

v Patented Apri! 12, 1853.

N. PEYERS, Phulo Lvll UNITED STATES PATENT OFFICE.

CULLEN W'HIPPLE, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE NEIV ENGLAND SCREW COMPANY.

IMPROVEMENT lN MACHINERY FOR SHAVING THE HEADS OF SCREW-BLANKS.

Specification forming part of Letters Patent No. 9,669, dated April 12, 1853; antedated November 30, 1852.

To all whom it may concern.-

Be it known that I, OULLEN WHIPPLE, of the city and county of Providence, and State of Rhode Island, have invented certain new and useful Improvements in Machinery for Making Wood-Screws, of which the following is afull, clear, and exact description, reference being had to the annexed drawing of the same, which makes part of this specification.

My invention and improvement relate to the method of shaving the heads of screwblanks; and it consists in moving the cutter that performs this operation against the head of the blank in either a curved or straight line, but always in a direction oblique to the axis of rotation of the blank and in or nearly in a line with the under side of its head, so that the pressure of the cutter against the blank may be mainly in the direction of its length, thus avoiding the great tendency to force it out of the jaws by lateral pressure, which always exists when the tool approaches it at rightangles to its axis of rotation, by

which arrangement the use of a rest is dis-v pensed with, which insures the production of a round head on the blank, whether the wire of which the blank is made be round or otherwise, and as wire is generally more or less flattened this feature of my invention is of considerable importance.

The accompanying drawing represents a top view of a hollow revolving mandrel O, fitted with apair of gripping-jaws to hold the blank to be shaved. This mandrel is supported in a pair of puppet-heads B, which project upward from a bench A, on which the cuttingtool and its holder with the rest of the mechanism of a machine for shaving the heads of screw-blanks are supported.

As the mandrel and the several other parts of the mechanism for feeding, holding, and

rotating the blank are constructed and ar-' ranged in the manner described in another specification of one of my shavers, it is unnecessary to describe these parts here, and therefore I shall confine my description to the tool-holder and the manner of causing the tool to act upon the blank, which constitute the subject-matter of my present improvements.

The tool-holder is mounted on abracketA on the side of the bench A, and consists of an upright shaft S carrying at its upper end an arm S, on the extremity of which the cutter T is secured by clamp-screws or otherwise. The lower extremity of this shaft carries a second arm S upon which a cam S on the shaft K acts to turn the holder on its shaft S to force the tool T against the screwblank 0 to be dressed. This arm has a setscrew t in its end, by the adjustment of which the tool will be caused to approach within a greater or less distance of the axis of the blank, or, in other Words, will dress its head down more or less. WVhen the most protuberant part of the cam S is not acting against the arm S, the latter is pulled inward by a spring S to turn the upper arm S outward to remove the cutter out of the way of the feeder which supplies blanks to the gripping-jaws, and of the receiving-tube which receives the shaved blanks, so as to allow both to perform their functions properly. .The tool when mounted in a holder thus constructed and arranged will approach the head of the blank to shave it at about an angle of forty-five degreesto its axis of rotation. Thismode of operating a tool of the proper form to shape thehead of the blank will cause the under or inclined side of the head to be acted upon first and then the top, and the tool will press mainly in the direction of the length of the blank and toward the end of the mandrel, so that its pressure when thus acting will have but little tendency to wrench the blank out of the jaws. By this means the blank can be held while being shaved with sufficient firmness without the use of a rest to supportit against the pressure of the cutter, and will consequently rotate freely on its axis, so that when finished its head will be round, whatever may have been its form in its rough state previous to being shaved. This oblique movement of the cutter may be produced by carrying it with the tool-holder to ward and from the head of the blank on ways or guides inclined to its axis of rotation instead of employing the swinging or oscillating arm to carry it obliquely against the blank; but I do not deem it necessary to describe in detail this and other means which might be used to present the tool obliquely to the blank, asI deem the idea to be new, and that my invention is not dependent upon any particular form or arrangelnent of mechanism that may be adopted for carrying it into effect.

I am aware that in machines for shaving I the heads of screw-blanks the shaving-cutter,

Whether moving 011 a slide or a rocker, has been moved toward and from the blank obliquely to the axis of the blank, and therefore I do not claim, broadly, the moving of such cutter obliquely; but

What I do claim as my invention, and desire to secure by Letters Patent, is

The method of shaving the heads of screw- 

